The origins of Mug Root Beer trace back to San Francisco in 1940, when it was first introduced as "Belfast Root Beer" by the Belfast Beverage Company.
Its parent company, founded in 1877, had already established itself as a producer of sparkling water and ginger ale before venturing into root beer.
The creation of Belfast Root Beer, which would later become Mug Root Beer, represented a significant expansion of the company's product line, building on their decades of experience in the beverage industry.
The 1950s catchphrase "You haven't tasted Root Beer like this in years!" used by Mug Root Beer (then known as Belfast Old Fashioned Mug Root Beer) tapped into a sense of nostalgia and quality that was common in advertising during that era.
The slogan aimed to differentiate Mug from other root beers by suggesting a return to a classic, superior taste, perhaps appealing to adults who remembered root beers from their youth.
The marketing approach aligned with the broader 1950s advertising trend of emphasizing tradition, quality, and the idea that newer products could recapture the "good old days.”
The introduction of Sugar Free Mug in the late 1960s positioned Mug Root Beer as an early adopter in the diet soda market, following the trend set by major brands like Diet Rite (1958) and Tab (1963).
Looking to capitalize on the growing health consciousness and demand for low-calorie alternatives in the American beverage market, a movement that gained significant momentum throughout the 1960s and 1970s as more consumers sought sugar-free options.
PepsiCo's acquisition of Mug Root Beer in 1986 marked a strategic move to strengthen its position in the root beer market, replacing its previous offering, On-Tap Draft Style Root Beer, with a more established brand.
The introduction of the bulldog mascot "Dog" holding a mug of root beer after the acquisition was part of a rebranding effort to give Mug Root Beer a distinct, memorable identity within the PepsiCo portfolio, appealing to consumers with a friendly and playful image.
By 1986, Mug Root Beer had become a powerhouse in the Pepsi bottling industry, with three Bay Area facilities producing an impressive 1,200 cases of Pepsi per minute.
This production capacity had elevated the company to the position of second-largest privately owned Pepsi bottler in the United States.
Mug Root Beer's history is deeply rooted in San Francisco, where it originated, though PepsiCo ceased local production in the early 1990s.
The brand expanded its offerings over time, introducing Mug Cream Soda and Diet Mug Cream Soda, albeit with more limited availability compared to its flagship root beer.
Despite being owned by PepsiCo, Mug Root Beer maintains a unique production model, with independent bottlers manufacturing the beverage under the authority of New Century Beverage Company, preserving some of its original operational structure.